Fiber dimensions vs. yield, hemicelluloses and hygroscopicity of pine and maple kraft pulps
Küçük Resim Yok
Tarih
2004
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Dergi ISSN
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Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Sixteen never-dried alkaline pine and maple pulps at four different hemicellulose retention levels were tested regarding their equilibrium response to humidity cycles. The pulp yields ranked polysulfide>kraft>biokraft>soda. When fractionated the hemicellulose-rich fibers were more flexible passing longer tracheids through the screens. Fiber dimension measurement with FiberLab proved to match with the gravimetric yield determination. To elucidate the hygroscopicity of the fibers their chemical compositions (hemicellulose, water etc.) were expressed as mass per fiber length. Consequently, a single formula representing the hemicellulose content of the fibers exhibited a universal correlation with the fiber moisture content at different relative humidities between 20 and 80 %. In general the work visualizes fibers as individual building blocks of paper and elaborates the concept of evaluating the hygroscopicity of pulps from the viewpoint of individual fibers. In the pine pulps the arabinose units seemed to be associated with the moisture gain between the preconditioning and the conditioning humidities commonly used for paper testing, In a separate study an arabinose-specific enzymatic debranching improved the pulp resistance to moisture adsorption. The work provides tools to monitor and control the yield and the composition of hemicelluloses for better dimensional stability in papers.
Açıklama
Proceedings - PulPaper 2004 Conferences, Efficiency -- 1 June 2004 through 3 June 2004 -- Helsinki -- 64314
Anahtar Kelimeler
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Kaynak
Proceedings - PulPaper 2004 Conferences, Efficiency
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